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esp32cam-demo/Misc/VeryBasicWebserver.ino

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9.9 KiB
Arduino
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very simple webserver demo for esp32
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// ----------------------------------------------------------------
//
//
esp8266 or esp32
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// ESP32 / ESp8266 very basic web server demo - 02Jan21
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//
// Starting point to experiment with
//
//
// ----------------------------------------------------------------
// Wifi settings
const char *SSID = "your_wifi_ssid";
const char *PWD = "your_wifi_pwd";
bool serialDebug = 1; // if to enable debugging info on serial port
// ----------------------------------------------------------------
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//#include <arduino.h> // required by platformio?
#if defined ESP32
// esp32
byte LEDpin = 2;
#include <WiFi.h>
#include <WebServer.h>
#include <HTTPClient.h> // Web server running on port 80
WebServer server(80);
#elif defined ESP8266
//Esp8266
byte LEDpin = D4;
#include <ESP8266WiFi.h>
#include <ESP8266WebServer.h>
#include "ESP8266HTTPClient.h"
ESP8266WebServer server(80);
#else
#error "This sketch only works with the ESP8266 or ESP32"
very simple webserver demo for esp32
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#endif
// ----------------------------------------------------------------
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// this section runs once at startup
very simple webserver demo for esp32
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Add files via upload
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very simple webserver demo for esp32
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void setup() {
Serial.begin(115200); // start serial comms at speed 115200
Serial.println("\n\nWebserver demo sketch");
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// onboard LEDs
pinMode(LEDpin, OUTPUT);
digitalWrite(LEDpin, LOW);
very simple webserver demo for esp32
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// Connect to Wifi
Serial.print("Connecting to ");
Serial.println(SSID);
WiFi.begin(SSID, PWD);
while (WiFi.status() != WL_CONNECTED) {
Serial.print(".");
delay(500);
}
Serial.print("Connected. IP: ");
Serial.println(WiFi.localIP());
// set up web server pages to serve (API resources)
server.on("/test", handleTest); // '/test' URL is requested, run the procedure named 'handleTemp'
server.on("/button", handleButton); // '/button' URL requested
server.on("/", handleRoot); // root web page requested
server.onNotFound(handleNotFound); // if invalid url is requested
// start web server
server.begin();
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#if defined ESP32
WiFi.setSleep(false); // stop the wifi being turned off if not used for a while (esp32)
#else
WiFi.setSleepMode(WIFI_NONE_SLEEP); // stop the wifi being turned off if not used for a while (esp8266)
#endif
WiFi.mode(WIFI_STA); // turn off access point - options are WIFI_AP, WIFI_STA, WIFI_AP_STA or WIFI_OFF
very simple webserver demo for esp32
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} // setup
// ----------------------------------------------------------------
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// this section runs repeatedly in a loop
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void loop() {
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server.handleClient(); // service any web page requests
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digitalWrite(LEDpin, !digitalRead(LEDpin)); // invert onboard LED status
delay(200); // wait 200 milliseconds
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} // loop
// ----------------------------------------------------------------
// -test web page requested i.e. http://x.x.x.x/
// ----------------------------------------------------------------
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// demonstrate sending a plain text reply
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void handleRoot(){
if (serialDebug) Serial.println("Root page requested");
String message = "root web page";
server.send(404, "text/plain", message); // send reply as plain text
} // handleRoot
// ----------------------------------------------------------------
// -test web page requested i.e. http://x.x.x.x/test
// ----------------------------------------------------------------
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// demonstrate sending html reply
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void handleTest(){
if (serialDebug) Serial.println("Test page requested");
WiFiClient client = server.client(); // open link with client
// html header
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client.print("<!DOCTYPE html> <html lang='en'> <head> <title>Web Demo</title> </head> <body>\n"); // basic html header
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// html body
client.print("<h1>Test Page</h1>\n");
// end html
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client.print("</body></html>\n");
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delay(3);
client.stop();
} // handleTest
// ----------------------------------------------------------------
// -button web page requested i.e. http://x.x.x.x/button
// ----------------------------------------------------------------
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// demonstrate use of a html buttons
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void handleButton(){
if (serialDebug) Serial.println("Button page requested");
// check if button1 has been pressed
if (server.hasArg("button1")) {
Serial.println("Button 1 was pressed");
}
// check if button2 has been pressed
if (server.hasArg("button2")) {
Serial.println("Button 2 was pressed");
}
// send reply to client
WiFiClient client = server.client(); // open link with client
// html header
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client.print("<!DOCTYPE html> <html lang='en'> <head> <title>Web Demo</title> </head> <body>\n"); // basic html header
client.print("<FORM action='/button' method='post'>\n"); // used by the buttons in the html (action = the web page to send it to
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// html body
client.print("<h1>Button demo page</h1>\n");
if (server.hasArg("button1")) client.print("Button 1 has been pressed!");
if (server.hasArg("button2")) client.print("Button 2 has been pressed!");
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client.print("<br><br><input style='height: 35px;' name='button1' value='Demo button 1' type='submit'> \n");
client.print("<br><br><input style='height: 35px;' name='button2' value='Demo button 2' type='submit'> \n");
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// end html
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client.print("</body></html>\n");
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delay(3);
client.stop();
} // handleButton
// ----------------------------------------------------------------
// -invalid web page requested
// ----------------------------------------------------------------
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// send this reply to any invalid url requested
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void handleNotFound() {
if (serialDebug) Serial.println("Invalid page requested");
String tReply;
tReply = "File Not Found\n\n";
tReply += "URI: ";
tReply += server.uri();
tReply += "\nMethod: ";
tReply += ( server.method() == HTTP_GET ) ? "GET" : "POST";
tReply += "\nArguments: ";
tReply += server.args();
tReply += "\n";
for ( uint8_t i = 0; i < server.args(); i++ ) {
tReply += " " + server.argName ( i ) + ": " + server.arg ( i ) + "\n";
}
server.send ( 404, "text/plain", tReply );
tReply = ""; // clear variable
} // handleNotFound
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very simple webserver demo for esp32
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// ----------------------------------------------------------------------------------------------------------------
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// Not used in this sketch but provided as an example of how to request an external web page and receive the reply as a string
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// ----------------------------------------------------------------
// request a web page
// ----------------------------------------------------------------
// parameters = ip address, page to request, port to use (usually 80), maximum chars to receive, ignore all in reply before this text
// e.g. String reply = requestWebPage("192.168.1.166","/log",80,600,"");
String requestWebPage(String ip, String page, int port, int maxChars, String cuttoffText = ""){
int maxWaitTime = 3000; // max time to wait for reply (ms)
char received[maxChars + 1]; // temp store for incoming character data
int received_counter = 0; // number of characters which have been received
if (!page.startsWith("/")) page = "/" + page; // make sure page begins with "/"
if (serialDebug) {
Serial.print("requesting web page: ");
Serial.print(ip);
Serial.println(page);
}
WiFiClient client;
// Connect to the site
if (!client.connect(ip.c_str() , port)) {
if (serialDebug) Serial.println("Web client connection failed");
return "web client connection failed";
}
if (serialDebug) Serial.println("Connected to host - sending request...");
// send request - A basic request looks something like: "GET /index.html HTTP/1.1\r\nHost: 192.168.0.4:8085\r\n\r\n"
client.print("GET " + page + " HTTP/1.1\r\n" +
"Host: " + ip + "\r\n" +
"Connection: close\r\n\r\n");
if (serialDebug) Serial.println("Request sent - waiting for reply...");
// Wait for a response
uint32_t ttimer = millis();
while ( !client.available() && (uint32_t)(millis() - ttimer) < maxWaitTime ) {
delay(10);
}
// read the response
while ( client.available() && received_counter < maxChars ) {
#if defined ESP8266
delay(2); // it just reads 255s on esp8266 if this delay is not included
#endif
received[received_counter] = char(client.read()); // read one character
received_counter+=1;
}
received[received_counter] = '\0'; // end of string marker
if (serialDebug) {
Serial.println("--------received web page-----------");
Serial.println(received);
Serial.println("------------------------------------");
Serial.flush(); // wait for serial data to finish sending
}
client.stop(); // close connection
if (serialDebug) Serial.println("Connection closed");
// if cuttoffText was supplied then only return the text following this
if (cuttoffText != "") {
char* locus = strstr(received,cuttoffText.c_str()); // locus = pointer to the found text
if (locus) { // if text was found
if (serialDebug) Serial.println("The text '" + cuttoffText + "' was found in reply");
return locus; // return the reply text following 'cuttoffText'
} else if (serialDebug) Serial.println("The text '" + cuttoffText + "' WAS NOT found in reply");
}
return received; // return the full reply text
}
// ----------------------------------------------------------------
// end